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1、原因状语从句A、引导原因状语从句的连词 原因状语从句一般由从属连词because,as,since，nowthat引导。B、because,as,since和nowthat的区别：1、because“因为”，表示直接的原因，语气最强。1）why提问的句子，必须用because回答。2）because的从句常放在主句之后。3）because不能与so连用。4）because+从句；becauseof+名词短语ImissedthetrainbecauseIgotuplate.Hewasangrynotbecausewewerelatebutbec
2、ausewemadeanoise.-Whydidn’thecomeyesterday? -Becausehewasill.2、as“因为”，语气较弱，一般放在主句前，中间用逗号隔开，表示的是明显的原因。Ashewasnotwell,Idecidedtogotherewithouthim.Asitwasraininghard,wehadtobeindoors.3、since/nowthat“既然”，一般放在主句前，中间用逗号隔开，表示的是明显的原因或众所周知的事实。Since/Nowthatthismethoddoesn’twork,let’s
3、tryanother.Since/Nowthatyoufeelill,you'dbetternotgotowork.Exercise:一、填入恰当的连词1.Ididn’tgotoschoolyesterday_________Iwasill.2.________everybodyishere,let’sbeginourmeeting.3.________youareinpoorhealth,youshouldnotstayuplate.4.Iaskedhertostaytotea,________Ihadsomethingtotellher.
4、5.________allthepassengersarehere,whydon’twestartatonce?6.Billwon’tmakeanyprogress________hedoesn’tstudyharderthanbefore. 二、改写句子,保持句意不变1)Theshipchangeditscoursebecausetherewasastorm.Theshipchangeditscourse ____________________________.2)Becausehewasill,hedidn’tgotoschoo
5、l.Hewasill,_______hedidn’tgotoschool.3)Hecouldn'twalkbecausehislegwasbroken.Hecouldn'twalk____________his______leg.4)Icamebackbecauseitwasrainingheavily.Icameback____________the______rain.三、选择恰当的答案1.Themancan’tgetonthebus______thereisnoroomonit.A.thoughB.becauseC.untilDsoth
6、at2.______herdaughterhadn’tcomeback,______shelookedworried.A.Because,/B.Because,soC.Though,butD.Though,/3._______you’vegotachance,youmightmakefulluseofit.A.NowthatB.AfterC.AlthoughD.AssoonasKeys：A、引导原因状语从句的连词：because,as,since，nowthatB、because,as,since和nowthat的区别：1、because：“
7、因为”，表示直接的原因，语气最强。1）why提问的句子，必须用because回答。2）because的从句常放在主句之后。3）because不能与so连用。4）because+从句；becauseof+名词短语2、as：“因为”，语气较弱，一般放在主句前，中间用逗号隔开，表示的是明显的原因。3、since/nowthat：“既然”，一般放在主句前，中间用逗号隔开，表示的是明显的原因或众所周知的事实。课堂练习：一、1.because2.Since3.As4.because5.Since6.because二、1.becauseofthestorm
8、2.so3.becauseofbroken4.becauseofheavy三、1.B2.A3.A
